Transposons, eg, many
broad host range transposons from E. coli with antibiotic
resistance genes, some from Drosophila, such as mariner are
found in all kingdoms

Artificial vectors
made by recombining viral genomes, plasmids and transposons, carrying
one or more antibiotic resistance genes; used for gene amplification,
DNA sequencing, transfection, gene therapy, etc. [5], many are
shuttle-vectors designed for replication in more than one
species, ‘pantropic’
vectors cross many species barriers